CVE-2025-11679 MEDIUM

CVE-2025-11679: Out-of-bounds Read in libwebsockets PNG parsing

Vendor Warmcat
Product libwebsockets
Weakness CWE-125
Published October 20, 2025
Last update October 20, 2025
View on NVD All CVEs

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

Out-of-bounds Read in lws_upng_emit_next_line in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to read past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big height dimension.

Key dates

02Disclosure timeline

October 20, 2025 CVE published
October 20, 2025 Record updated